Demurrage Calculator
Estimate demurrage charges by multiplying a daily rate by the number of chargeable days, plus an optional flat fee. Demurrage is the penalty charged when a shipping container, vessel, or railcar is held beyond the contractually allowed free time at a port, terminal, or yard. This calculator helps freight forwarders, importers, and logistics teams quickly estimate delay costs for budget planning.
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Formula
Demurrage is typically charged per calendar day or per business day after the allowed free time expires. The daily rate is set by the shipping line, port authority, or contract. Some agreements also include a fixed administrative or handling fee on top of the per-day charges. This calculator sums both components for a quick estimate.
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Frequently Asked Questions
Is this calculator legally binding for demurrage disputes?
No. This is a planning estimate only. Your charter party, bill of lading, port tariff, or container lease agreement defines the actual rates, free time allowance, exceptions, and billing terms. Always refer to your contract for official demurrage calculations.
What is the difference between demurrage and detention?
Demurrage is typically charged while a container sits at a port or terminal beyond free time. Detention is charged when a container is kept outside the port (at a warehouse, customer site) beyond the allowed period. Some shipping lines use the terms interchangeably. This calculator works for either scenario.
What currency should I enter?
Enter numbers in whatever currency your contract specifies (USD, EUR, GBP, etc.). The calculator performs pure arithmetic without currency conversion.
Can daily rates increase over time?
Yes, many shipping lines use tiered rate schedules where the daily rate increases after certain day thresholds (e.g., days 1 to 5 at $100/day, days 6 to 10 at $200/day). This calculator uses a single flat rate. For tiered schedules, calculate each tier separately and sum the results.
How many free days are typical before demurrage starts?
Import containers typically get 3 to 7 free days at origin and destination ports. Export containers may get 5 to 10 free days. Free time varies by shipping line, port, and trade lane. Check your booking confirmation for specific free time allowances.
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